Perhaps you should try some spelling variations:
decreases sperm » decreased sperm (Expand search), decreases serum (Expand search), decreasing sperm (Expand search)
decrease drugs » disease drugs (Expand search), decrease treg (Expand search), release drugs (Expand search)
drugs decrease » drugs increases (Expand search), drugs release (Expand search)
sperm decrease » term decrease (Expand search), speed decrease (Expand search), speed decreases (Expand search)
decrease disk » decrease risk (Expand search), decreased risk (Expand search), decrease milk (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search)
disk object » dark object (Expand search), mask object (Expand search), task object (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease the decrease drugs decrease ) OR ( decreases sperm decrease disk object ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease the decrease drugs decrease ) OR ( decreases sperm decrease disk object ))*.